"You will not be offended if I say no"

From personal experience. You’ve done something wrong, for example, you’ve been out for a long time. And instead of excitement, she had such a subtle feeling that now she will again be bored and unskilled to fuck. Sex in this situation is better to cancel.

p.s But it’s better to say "I’m already offended" than to joke "Of course not, dear". And even better turn the head back, the cock can still be turned off.